The books i'm working out of seem to all be using version 1.2 or 1.3, but in looking for reference stuff online, everything seems to be 1.5 oriented, though there's a lot of stuff on versions up to 1.9.
Tried to decipher what I needed from Wikipedia, the ECMA standard, and the Mozilla developer pages, but to no avail.
I'm sure learning the older version gives me a solid foundation, but is there someplace I can find some kind of comparison charts?
Also, what is the newest acceptable version that has the most cross-browser compatibility?
Any input here would be greatly appreciated! Thanks!